I'm sure there's SPX traders here who will tell you about the 8 point!! deviations some expirations between SPX "SET" and the "trading" price of the Index. The CBOE will list SET in a few minutes. I'll try to post the price. It looks though that today was a benign settlement.
The merc has the final print at 1323.12. this is the price you will recieve on your sep futures. cash settled. Jim